Thank you Paul for your reply and help, I followed your corrections with the CSV file and while now SAM doesn't display any errors with the conversion, it does show the following message:
It ends up creating a SAM CSV but the problem is that as the error says, it doesn't determine the timestep and so the CSV takes the timestep and its values as columns rather than ordering them in the correct columns for Year, Month, etc. Why is this so? I'm attaching both the CSV corrected for the previous mistakes and the new CSV that SAM creates so my problem is better understood.
Thanks and best regards,
Emiliano